Kodi Astm a269 tubing ndi chiyani?

Ndife opanga zitsulo zosapanga dzimbiri astm a249 coil chubing, muyezo ndi ASTM A 249 Coil chubu, chubu ndi Standard ndi ASTM A249.pamwamba ndi yowala, kutalika ndi 4000m/Koyilo, chubu koyilo ndi ofewa, akhoza uased kumunda mafuta, chitoliro koyenera, Zida